Limit ansible to 13.x to avoid breaking api change

inventory plugins still use the 'required' parameter, removed from get_bin_path()

Author: elelaysh

.github/workflows/multinode.yml

@@ -181,7 +181,7 @@ jobs:
           python3 -m venv venv &&
           source venv/bin/activate &&
           pip install -U pip &&
-          pip install ansible &&
+          pip install "ansible<14" &&  # ansible-core 2.21 breaks inventory plugins with 'required' removed from get_bin_path()
           mkdir -p ansible/{collections,roles} &&
           ansible-galaxy role install -r ansible/requirements.yml -p ansible/roles &&
           ansible-galaxy collection install -r ansible/requirements.yml -p ansible/collections